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i'm sure there's some folc who knows the metropolis area code. it has to have been onscreen at some point.
There is and it was! In the first season in the episode Barbarians at the Planet Lois is ordering some shoes out of a catalouge and she gives the area code for her phone number as "217".

The reason I remembered this is "217" is the area code for central Illinois.

Hope that helps!

Birdie

"Let us remember that there is a creative force in this universe, working to pull down the gigantic mountains of evil, a power that is able to make a way out of no way and trasform dark yesterdays into bright tomorrows. Let us realize the arc of the moral universe is long, but it bends toward justice."
-- Martin Luther King Jr.